JP2009031278A - 衛星測位システム(sps)信号の測定処理用の方法および装置 - Google Patents
衛星測位システム(sps)信号の測定処理用の方法および装置 Download PDFInfo
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Abstract
【解決手段】対応する複数のSPS衛星からのSPS信号が、SPS受信機で受信される。SPS受信機の場所に対応する信号環境が特徴付けられ、信号環境データが生成される。例えば、GPS受信機の近似場所を考慮して、セルラーネットワークベースのデータベース等の情報源が探索され、信号環境データを検索する。この近似場所は、GPS受信機と同じ場所に配置されるセルラー通信装置とセルラー無線通信しているセルサイトの場所によって指定されてよい。衛星信号の信号特徴に関連するパラメータが定義され、パラメータの閾値は信号環境データを用いて求められる。複数の衛星からの衛星信号の到着時刻に対応するコードフェーズが測定される。測定されたデータが、GPS受信機の場所修正が計算される到着時刻の集合を生じさせるためにパラメータの閾値を使用して調べられる。
【選択図】図4
Description
図1は、本発明の方法を実現するために使用できるGPS受信システムのブロック図である。図1のGPS受信システムは、GPS処理段階または通信段階を含む移動または遠隔GPS受信機装置20を含む。このようにして、GPS受信機装置20は、通信リンクを通して送受される通信信号を処理するために必要とされる機能だけではなく、GPS信号を処理するために必要とされる機能も実行するための回路構成要素を含む。データリンク16などの通信リンクは、典型的には、通信アンテナ14を有する基地局10などの別の通信構成要素への無線周波数通信リンク(例えば、セルラー電話通信リンク)である。
本発明の1つの実施形態においては、改善されたGPS受信機が、視野内の衛星ごとのいくつかの異なる形式のデータを処理する。これらのデータ形式は、(到着時刻を測定する)メインピークとも呼ばれる最大相関ピーク値に対応するコードフェーズ、(例えば、1/8、1/4、1/2、1 C/Aコードチップで、または何らかの他の任意の間隔で計算される)最大相関ピーク値周辺のコードフェーズの組、(例えば、ピークより3dB低いなどのなんらかの選択された信号レベルで計算される)相関ピーク幅、(コードフェーズ変化率を側定数)ドップラー、信号対混信率(SIR)、積分期間、および複数のピーク、およびメインピークを基準にしたその場所(複数の場合がある)の存在を示すフラグを含む。
図5は、本発明のある実施形態に従って、図4の動作101として図解されている信号環境特徴付けプロセスに含まれる動作を概略するフローチャートである。GPS受信機の信号環境を特定すること、あるいは達成することは、さまざまな用途に最大の柔軟性を達成し、多様な性能レベルを支持するために重要である。
図6は、本発明のある実施形態に従って、図4の動作103として示されているアルゴリズム制御パラメータセットアッププロセスの動作103として示されているアルゴリズム制御パラメータセットアッププロセスに含まれる動作を概略するフローチャートである。信号閾値の初期選択は、動作301で実行される。ある実施形態においては、この初期選択は、図5のフローチャートに図解されているように、動作101の信号環境決定に基づく。動作301で選択される信号閾値は、最小信号対雑音(SNR)比および信号対混信(SIR)比を含む。例えば、サンフランシスコの都市の峡谷が例示的な信号環境として使用される場合、最小の信号対雑音比および信号対干渉比は、それぞれ15.5dBと14.5dBに設定される。これらの閾値は、動作105の衛星測定選択で使用される。
図7は、本発明のある実施形態に従って、図4の動作105として図解される測定選択および計算プロセスに含まれる動作を概略するフローチャートである。測定選択および計算プロセスは、確定位置測定値を事前にフィルタリングし、本発明の測定処理方法を使用する追加のGPS信号処理に必要とされるパラメータを計算するために役立つ。
図8は、本発明のある実施形態に従って、図4の動作107に示される障害検出および分離(FDI)に含まれる動作を概略するフローチャートである。
図9は、本発明のある実施形態に従って、図4の動作109として示される偏向調整プロセスに含まれる動作を概略するフローチャートである。
図10は、本発明のある実施形態に従って、図4の動作111として示される連続測定最適化(SMO)プロセスで含まれる動作を概略するフローチャートである。
図11は、本発明のある実施形態に従って、図4の動作113として示されている最終的な計算および誤差概算プロセスに含まれる動作を概略するフローチャートである。
Claims (66)
- 衛星測位システム(SPS)受信機で受信される衛星信号の到着時刻を測定する方法であって、前記方法が、
複数のSPS衛星から複数のSPS信号を受信することと、
前記SPS受信機が位置する場所に対応する信号環境を特徴付け、SPS信号が前記場所に局所的に伝搬される方法を表す環境データを生成することと、
前記複数の衛星の内の2つまたは複数の衛星からそれぞれの衛星信号の到着時刻を測定することと、
前記環境データを使用して前記到着時刻を表すデータを処理し、前記SPS受信機の場所修正を計算するために用いる到着時刻の集合を生成することと、
を備える。 - 前記環境データが、前記複数の信号の内の任意の信号の信号対雑音比、信号対混信比、入力信号強度、信号減衰、相関関数波形、およびピーク幅値の少なくとも1つを備える請求項1に記載の方法。
- SPS信号が前記場所の約1000メートル以内にあるときに、SPS信号が前記場所に局所的に伝搬される請求項1に記載の方法。
- 前記特徴付けが、前記信号環境が屋内環境に似ているのか、あるいは屋外環境に似ているのかを判断することを備える請求項3に記載の方法。
- 前記方法が、
1つまたは複数の軌道を外れたSPS信号を特定することと、
1つまたは複数の軌道を外れたSPS信号を特定した結果、前記SPS受信機によって実行される到着時刻測定を補正することと、
をさらに備える請求項3に記載の方法。 - 前記SPS受信機が、組み合わせ受信機および無線通信装置内に含まれ、前記組み合わせ受信機が、前記環境データを使用して前記到着時刻を表す前記データを処理するように構成されるデジタルプロセッサを備える請求項3に記載の方法。
- 前記無線通信装置が、セルラー通信信号を処理するセルラー通信システムであり、前記特徴付けが、前記セルラー通信信号の信号パラメータを決定することを備える請求項6に記載の方法。
- 前記到着時刻の集合が、通信リンク上で基地局に送信される請求項3に記載の方法。
- 前記方法が、
第1SPS衛星からSPS信号の第1集合の第1の考えられる相関ピークを決定することと、
SPS信号の前記第1集合の第2の考えられる相関ピークを決定することと、
SPS信号を前記第1集合を受信した前記SPS受信機から、前記第1のおよび前記第2の考えられる相関ピークが決定されたという識別を送信することと、
をさらに備える請求項3に記載の方法。 - 前記到着時刻の集合の到着時刻測定が、前記信号環境に基づいた偏向調整で補正される請求項3に記載の方法。
- 衛星測位システム(SPS)受信機の位置を決定する方法であって、前記方法が、
SPS衛星からSPS信号を受信することと、
前記SPS信号の相関出力のピーク幅値の少なくとも選択された1つ、または前記SPS信号の信号対混信比(SIR)を決定することと、
前記ピーク幅値の前記選択された1つ、または前記SIRを使用して、前記SPS受信機の前記位置を決定することと、
を備える。 - 前記方法が、
1つまたは複数の軌道を外れたSPS信号を特定することと、
1つまたは複数の軌道を外れたSPS信号を特定した結果として、前記SPS受信機によって実行される到着時測定値を補正することと、
をさらに備える請求項11に記載の方法。 - 前記到着時刻測定値が前記ピーク幅値または前記SIRに基づいて偏向調整で補正される請求項11に記載の方法。
- 衛星受信機システム(SPS)受信機で受信される衛星信号の到着時刻を測定する方法であって、前記方法が、
複数のSPS衛星から複数のSPS信号を受信することと、
前記SPS受信機が位置する場所に対応する信号環境を特徴付け、環境データを作成することと、
前記環境データを使用して、前記衛星信号の1つまたは複数の特徴に関係する1つまたは複数のパラメータに閾値を選択することと、
前記複数の衛星の内の2つまたは3つ以上の衛星からそれぞれの衛星信号の到着時刻を測定し、複数の測定済み到着時刻を生じさせることと、
前記閾値を使用して前記到着時を表すデータを試験して、前記SPS受信機の場所修正を計算するために用いる到着時刻の集合を生じさせることと、
を備える。 - 前記環境データの1つまたは複数の特徴が、前記複数の信号の内の任意の信号の信号対雑音比、信号対混信比、入力信号強度、信号減衰、相関関数波形、およびピーク幅値の内の少なくとも1つを備える請求項14に記載の方法。
- 前記信号環境を前記特徴付けることが、さらに、前記SPS受信機が建物の内部に位置する間に複数のSPS信号を受信する場合に、前記信号環境を屋内環境として、あるいは前記SPS受信機が建物の内部に位置しない間に前記複数のSPS信号を受信する場合に屋外環境として特徴付けることを備える請求項15に記載の方法。
- 前記SPS受信機が、事前に定義された数の建物のある地域内に位置する間に前記複数のSPS信号を受信する場合に都市環境として、あるいは前記事前に定義された数より少ない建物のある地域内に位置する間に、前記SPS受信機が前記複数のSPS信号を受信する場合に地方環境として前記信号環境を特徴付けることを備える請求項16に記載の方法。
- 前記方法が、
1つまたは複数の軌道を逸れたSPS信号を特定することと、
1つまたは複数の軌道を逸れたSPS信号を特定した結果として、前記SPS受信機によって実行される到着時刻測定を補正することと、
をさらに備える請求項15に記載の方法。 - 前記方法が、
前記複数の測定された到着時刻の内の1つまたは複数の測定された到着時刻の偏向誤差を概算し、概算された偏向値を生成することと、
前記概算偏向値を使用して前記複数の測定到着時刻を補正することと、
をさらに備える請求項18に記載の方法。 - 前記方法が、
前記環境データを使用して測定到着時刻ごとに誤差閾値を定義することと、
前記それぞれの測定到着時刻の誤差を前記誤差閾値と比較することと、
前記到着時刻測定値の前記誤差が前記誤差閾値を超える場合に、到着時刻測定値を削除することと、
をさらに備える請求項19に記載の方法。 - 前記SPS受信機が、組み合わせ受信機および無線通信装置内に含まれ、前記組み合わせ受信機が、前記衛星信号の前記到着時刻を前記測定することを実行するように構成されるデジタルプロセッサを備える請求項16に記載の方法。
- 前記信号環境を特徴付けることが、前記複数のSPS信号の内の少なくとも1つの信号の信号対雑音比、信号対混信比、入力信号強度、信号減衰、相関関数波形、およびピーク幅値の少なくとも1つを求めることを備える請求項14に記載の方法。
- 前記無線通信装置が、セルラー電話を備え、前記SPS受信機の前記場所がセルラー電話送信領域内にある請求項21に記載の方法。
- 衛星測位システム(SPS)受信機を使用して場所を決定する方法であって、前記方法が、
複数の視野内SPS衛星から複数のSPS信号を受信することと、
前記複数のSPS信号ごとに積分期間を求め、前記積分期間が対応するSPS信号ごとに到着時刻測定を実行するために使用される時間の期間に対応することと、
前記複数のSPS信号の信号ごとに最大相関ピーク値および相関ピーク幅を求めることと、
前記最大相関ピーク値に相当するコードフェーズを求めることと、
前記複数のSPS信号ごとにドップラー値を求めることと、
前記複数のSPS信号のそれぞれと関連付けられた1つまたは複数の信号特徴を決定することと、
を備える。 - 前記方法が、
前記複数のSPS信号の前記それぞれの前記最大相関ピーク値周辺のコードフェーズの集合を求めることと、
前記積分期間内に発生する複数のピークが存在する前記複数のSPS信号の信号ごとにフラグをセットすることと、
をさらに備える請求項24に記載の方法。 - 前記複数のSPS信号のそれぞれに関連付けられた前記1つまたは複数の信号特徴が、信号対雑音比、ピーク幅値、入力信号強度値、信号減衰、相関関数波形、および信号対混信比の少なくとも1つを備える請求項24に記載の方法。
- 前記方法が、前記SPS受信機が環境データを生じさせるために位置する場所に対応する信号環境を特徴付けることをさらに備える請求項26に記載の方法。
- 前記方法が、前記環境データおよび対応する最大相関ピーク値、ドップラー値、コードフェーズ、および前記衛星に決定された信号特徴を使用してSPS信号の到着時刻を測定することをさらに備える請求項27に記載の方法。
- 前記方法が、所定の閾値基準を満たさない衛星によって送信されるSPS信号の到着時刻測定値を排除することをさらに備える請求項28に記載の方法。
- 前記方法が、所定の誤差閾値基準を満たさないSPS信号の到着時刻を排除することをさらに備える請求項28に記載の方法。
- 前記所定の誤差閾値基準が、前記複数の衛星の内の1つまたは複数の衛星によって送信される相互相関信号を備える請求項30に記載の方法。
- 複数の視野内衛星からSPS信号およびRF周波数を受信するためのアンテナと、
前記アンテナに接続されるダウンコンバータであって、前記受信されたSPS信号のRF周波数を中間周波数(IF)まで削減し、ベースバンド信号を生じさせる、前記ダウンコンバータと、
前記ダウンコンバータに接続されるデジタイザと、
前記デジタイザに接続されるプロセッサであって、
前記SPS受信機が位置している場所に対応する信号環境を決定し、環境データを作成し、
前記環境データを使用して前記衛星信号の1つまたは複数の特徴に関係する1つまたは複数のパラメータの閾値を選択し、
前記複数の視野内衛星の2つまたは3つ以上の衛生からそれぞれの衛星信号の到着時刻を測定し、複数の測定済み到着時刻を生成し、
前記1つまたは複数のパラメータの前記閾値を使用して、前記到着時刻を表すデータを試験し、前記SPS受信機の場所修正を計算するために用いる到着時刻の集合を生じさせるように構成される前記プロセッサと、
を備えるSPS受信機装置。 - 前記SPS受信機装置が、通信アンテナおよび前記通信アンテナに、および前記プロセッサに結合される通信受信機をさらに備え、前記通信受信機が、通信リンク上で衛星データ情報を含むデータ信号を受信するために使用できる請求項32に記載のSPS受信機装置。
- 前記到着時刻の集合が、前記通信リンク上で基地局に送信される請求項33に記載のSPS受信機装置。
- 前記通信リンクが、セルラー電話送信リンクを備える請求項34に記載のSPS受信機装置。
- 前記環境データが、前記SPS受信機が屋内に位置しているのか、あるいは屋外に位置しているのか、および前記SPS受信機が都市の場所に位置しているのか、あるいは地方の場所に位置しているのかを指定する請求項35に記載のSPS受信機装置。
- 前記環境データが、ユーザによって前記SPS受信機に入力される請求項36に記載のSPS受信機装置。
- 前記環境データが、前記通信リンクによって送信されるデータを解析することによって決定される請求項36に記載のSPS受信機装置。
- 衛星測位システム(SPS)信号を処理する方法であって、前記方法が、
第1SPS衛星からのSPS信号の第1集合の第1の考えられる相関ピークを求めることと、
SPS信号の前記第1集合の第2の考えられる相関ピークを求めることと、
前記第1の考えられる相関ピークおよび前記第2の考えられる相関ピークからSPS信号の前記第1集合の到着時刻を表す測定値を引き出すことと、
を備える。 - 前記第2の考えられる相関ピークが、時間内で前記第1の考えられる相関ピークに従う請求項39に記載の方法。
- 前記第2の考えられる相関ピークが反射SPS信号から生じる、請求項40に記載の方法。
- 前記到着時刻を表す前記測定値が、前記第1の考えられる相関ピークから引き出される請求項41に記載の方法。
- 前記方法が、
SPS信号の前記第1集合を受信したSPS受信機から、前記第1の考えられる相関ピークおよび前記第2の考えられる相関ピークが求められた旨の識別を送信することと、
をさらに備える請求項40に記載の方法。 - 前記方法が、
広いピーク相関出力を特定し、SPS信号の前記第1集合を受信した、SPS受信機の位置情報を決定するために使用される測定値から前記広いピーク相関出力を廃棄することと、
をさらに備える請求項40に記載の方法。 - 前記方法が、
遠隔処理システムで、前記到着時刻を表す前記測定値を受信し、前記識別を受信し、前記遠隔処理システムが、セルラー無線周波数ネットワークを通して前記SPS受信機に通信できるように接続されることと、
をさらに備える請求項43に記載の方法。 - 衛星測位システム(SPS)信号を処理する方法であって、前記方法が、
SPS信号が、SPS受信機が位置する場所で伝搬される方法を表す信号環境データを決定し、前記信号環境データが、前記場所の近くのSPS信号の多重路状態または干渉状態の少なくとも1つを表すデータを備えることと、
前記SPS受信機によって受信されるSPS信号を表すデータが前記信号環境データに基づいてどのように処理されるのかを決定することと、
を備える。 - 前記信号環境データが、電離圏状態とは実質的に無関係である請求項46に記載の方法。
- 前記信号環境データが、(a)信号対雑音比、(b)信号対混信比、(c)ピーク幅パラメータ、(d)入力信号強度値、(e)強力な衛星のパラメータ、および(f)信号減衰の内の少なくとも1つを備える請求項46に記載の方法。
- 前記方法が、
前記SPS受信機でSPS信号の到着時刻を表す測定値を送信することと、
セルラー無線周波数通信リンクを通して、到着時刻を表す前記測定値を遠隔処理システムで受信することと、
前記SPS受信機の位置の解を求めるために到着時刻を表す前記測定値を前記遠隔処理システムで処理することと、
を備える請求項46に記載の方法。 - 衛星測位システム(SPS)信号を処理する方法であって、前記方法が、
SPS信号の第1集合の第1の考えられる相関ピークを求めることと、
SPS信号の前記第1集合の第2の考えられる相関ピークを求めることと、前記第1の考えられる相関ピークおよび前記第2の考えられる相関ピークの1つからSPS信号の前記第1集合の到着時刻を表す測定値を引き出すことと、
SPS信号の前記第1集合を受信したSPS受信機から、前記第1の考えられる相関ピークおよび前記第2の考えられる相関ピークが求められた旨の識別を送信することと、
を備える。 - 前記第2の考えられる相関ピークが、時間内で前記第1の考えられる相関ピークに従う請求項50に記載の方法。
- 前記第2の考えられる相関ピークが反射SPS信号から生じる請求項51に記載の方法。
- 前記到着時刻を表す前記測定値が、前記第1の考えられる相関ピークから引き出される請求項52に記載の方法。
- 前記方法が、
広いピーク相関出力を特定し、SPS信号の前記第1集合を受信した前記SPS受信機の位置情報を決定するために使用される測定値からの前記広いピーク相関出力を廃棄することと、
をさらに備える請求項50に記載の方法。 - 前記方法が、
前記到着時刻を表す前記測定を遠隔処理システムで受信し、前記遠隔処理システムが、セルラー無線周波数ネットワークを通して前記SPS受信機に通信できるように結合されることと、
をさらに備える請求項50に記載の方法。 - 衛星測位システム(SPS)信号を処理する方法であって、前記方法が、
セルベースの情報源から、SPS信号が、SPS受信機が位置する場所で伝搬される方法を表す信号環境を決定することと、
前記信号環境に基づいて、前記SPS受信機によって受信されるSPS信号を表すデータがどのように処理されるのかを決定することと、
を備える。 - 前記方法が、
SPS信号の到着時刻を表す測定値を決定し、前記測定値が前記信号環境に基づくことと、
前記SPS受信機でSPS信号の到着時刻を表す前記測定値を送信することと、
セルラー無線周波数通信リンクを通して到着時刻を表す前記測定値を前記遠隔処理システムで受信することと、
測定時刻を表す前記測定値を前記遠隔処理システムで処理し、前記SPS受信機の位置の解を求めることと、
をさらに備える請求項56に記載の方法。 - 前記求めることが、少なくとも1つのSPS衛星からSPS信号の到着時刻測定を実行するために使用される積分時間を求める請求項46に記載の方法。
- コードフェーズの前記集合が、前記複数のSPS信号のそれぞれのコードフレーム全体を含む請求項24に記載の方法。
- 前記方法が、
所定の誤差閾値基準を満たさないSPS信号の到着時刻測定値を補正することと、
をさらに備える請求項28に記載の方法。 - 前記方法が、
前記環境データに少なくとも部分的に基づく位置を計算することと、
をさらに備える請求項27に記載の方法。 - 前記所定の誤差閾値基準が、前記複数の衛星の1つまたは複数の衛星によって送信される多重路信号によって引き起こされる複数のピーク値を備える請求項60に記載の方法。
- 前記衛星信号の前記特徴が、前記通信リンク上で前記基地局に送信され、前記特徴が、前記環境データを引き出すために使用される請求項34に記載のSPS受信機装置。
- 前記方法が、
SPS測定時刻測定値を求めることと、
前記信号環境に基づく偏向調整で前記到着時刻測定値を補正することと、
をさらに備える請求項46に記載の方法。 - 前記信号環境を特徴付けることが、信号対雑音比、信号対混信比、信号強度、またはセルラー通信システムによって受信されるセルラー通信信号のピーク幅値の少なくとも1つを求めることを備え、前記SPS受信機および前記セルラー通信システムがともに結合され、結合されたシステムの一部である請求項14に記載の方法。
- 前記信号環境データを前記決定することが、信号対雑音比、信号対混信比、信号強度、またはセルラー通信システムによって受信されるセルラー通信信号のピーク幅値の少なくとも1つを求めることを備え、前記SPS受信機および前記セルラー通信システムがともに結合され、結合されたシステムが一部となる請求項46に記載の方法。
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KR102043405B1 (ko) * | 2019-06-20 | 2019-11-12 | 주식회사 첨단공간정보 | 지아이에스를 기반으로 하는 지형지물 변형 편집용 영상처리 편집시스템 |
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